The following links are the most common for data retrieval:
The primary retrieval tool for Census and American Community Survey data.
The home page for the US Census Bureau.
Census web site with the current estimates for state, county and city.
Common Geographic Codes
A collection of helpful codes used in identifying common geographies as provided by the Missouri Census Data Center.
Census and ACS Information
Tool that allows the user to enter a location and get numerous data options with one click. Tool provided by the Missouri Census Data Center.